diff options
Diffstat (limited to 'storage/heap/hp_scan.c')
| -rw-r--r-- | storage/heap/hp_scan.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/storage/heap/hp_scan.c b/storage/heap/hp_scan.c new file mode 100644 index 00000000..f07efe6c --- /dev/null +++ b/storage/heap/hp_scan.c @@ -0,0 +1,77 @@ +/* Copyright (c) 2000-2002, 2005-2007 MySQL AB + Use is subject to license terms + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; version 2 of the License. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */ + +/* Scan through all rows */ + +#include "heapdef.h" + +/* + Returns one of following values: + 0 = Ok. + HA_ERR_RECORD_DELETED = Record is deleted. + HA_ERR_END_OF_FILE = EOF. +*/ + +int heap_scan_init(register HP_INFO *info) +{ + DBUG_ENTER("heap_scan_init"); + info->lastinx= -1; + info->current_record= (ulong) ~0L; /* No current record */ + info->update=0; + info->next_block=0; + info->key_version= info->s->key_version; + info->file_version= info->s->file_version; + DBUG_RETURN(0); +} + +int heap_scan(register HP_INFO *info, uchar *record) +{ + HP_SHARE *share=info->s; + ulong pos; + DBUG_ENTER("heap_scan"); + + pos= ++info->current_record; + if (pos < info->next_block) + { + info->current_ptr+=share->block.recbuffer; + } + else + { + /* increase next_block to the next records_in_block boundary */ + ulong rem= info->next_block % share->block.records_in_block; + info->next_block+=share->block.records_in_block - rem; + if (info->next_block >= share->records+share->deleted) + { + info->next_block= share->records+share->deleted; + if (pos >= info->next_block) + { + info->update= 0; + DBUG_RETURN(my_errno= HA_ERR_END_OF_FILE); + } + } + hp_find_record(info, pos); + } + if (!info->current_ptr[share->visible]) + { + DBUG_PRINT("warning",("Found deleted record")); + info->update= HA_STATE_PREV_FOUND | HA_STATE_NEXT_FOUND; + DBUG_RETURN(my_errno=HA_ERR_RECORD_DELETED); + } + info->update= HA_STATE_PREV_FOUND | HA_STATE_NEXT_FOUND | HA_STATE_AKTIV; + memcpy(record,info->current_ptr,(size_t) share->reclength); + info->current_hash_ptr=0; /* Can't use read_next */ + DBUG_RETURN(0); +} /* heap_scan */ |